Question

The diagram below shows a suspended uniform beam of weight 4N in equilibrium under the action of the force shown. The weight of the magnet is 8N.
         

1. Name the pole X.             
2. Indicate on the diagram all the forces acting on the beam.         
3. Calculate the force exerted by the electromagnet.    

Answer 1

1. South
2. Weight 4N, electromagnet/magnetic force and weight of magnet
3. (4N×0.3m) + (x × 0.2m) =8N×0.2
                    1.2Nm+0.2xm=1.6Nm
                                0.2xm=0.4Nm
                                      x=2N